roof specifications
TRANSCRIPT
ESTIMATION, COSTING &
SPECIFICATIONS
SUBMITTED BY11613,11627, 11644, 10610,11634,
11640
REPORT ON
ROOF
SPECIFICATIONS
SPECIFICATIONS FOR THE RCC
SLABS (1:2:4)
Proportions-
The proportions of cement concrete shall
be of one part of cement, two parts of sand
and four parts of aggregates by volume.
Cement-
The cement to be used in this work should
comply with the standard requirements.
Fine Aggregate-
Sand to be used in this work shall be clean and coarse and shall be free from the any
organic or vegetable matter.
The sand shall be washed, if there is any
trace of earth.
Water- The water to be used in concrete work
shall be clean ad fresh.
RCC FLOOR
REINFORCEMENT The steel reinforcement used in
RCC construction are of two types:
Mild steel & (2) Tor steel i.e. High
Yield Strength Deformed (HYSD)
steel.
In conventional RCC works, the
mild steel has been replaced by
the Tor steel bars except 6 mm.
diameter bars. The proportions of
cement concrete for the slab is
(1:2:4) i.e. M15.
All bars shall be placed as per the
design by the structural engineer
and utmost care shall be taken to
keep them in the same position
while packing concrete around
them.
Centering
The centering for the concrete
work shall be sufficiently strong
and rigid and in good
condition so as to turn out a
good smooth surface.
The formwork shall include all
forms of temporary and
permanent nature required to
be used during casting of
concrete.
The material for formwork shall
be of timber or steel plates or
plywood planks or any other
suitable material as approved
by the engineer.
The props to be used for
centering shall be of timber
having spacing less than 1.2m.
Mixing of Concrete-
The mixing of concrete shall be
done in a mechanical mixer or
by hand operations depending
upon the quantity of the
concrete which shall be
decided by the engineer.
For mechanical mixer, the mixing
drum shall be turned at least for
1.50 minutes after all the
ingredients are added and the
drum shall be completely
emptied every time.
For hand mixing the, the dry
concrete shall be mixed at least
three times and then required
quantity of water shall be added
to it and this work should be done
on the water tight platform.
Laying of Concrete-
Before starting laying of
concrete in position , the
concrete shall be well-watered.
The concrete shall be laid in
forms and tapped in such a way
that no honeycomb surface
appears on the removal of
forms.
All edges and corners of the
concrete surface shall remain
unbroken, sharp and straight in
line. The cement concrete work
shall be kept well-watered for at
least 20 days.
Finishing of Exposed surface-
All exposed surfaces of the
concrete work shall be finished with
12 mm. thick cement plaster of
sagol finish and three coats of
white or colour wash shall be
applied on these exposed surfaces
of concrete.
The items of plaster and white or
colour wash shall be carried out as
per specifications of the
corresponding items contained in
this document.
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